Curb jack



Nov. 15, 1932. H, F, Hom 1,888,083

CURB JAC K Filed June 20, 1952 Harold E Holiz @V` N wat vuldm/ of massof the curb section. v

Fatented Nov. l5, 1932 HARoIn') normaler Application led. .Tune 2Q,

My inventionrelates to curb jacks, its principal: object being theprovision Vof a j ack for raising a section of `curbing to grade so thatthe space underneath may be filled withsand i5 or otherfillingmaterial.

An object of the invention is the provision of a curb jack which willoperate over theA center of vmass of the curb section to cause allkparts of the curb section to beelevated l0 equally and simultaneously.

Another object of the invention is the provision of an adjustable.device for applying the lift at any one of several different points tobe determined by the vertical center line Another object of theinvention is the provision of a curb jack having interchangeable f jawsfor the various types of curbing.

Having in view these objects and others which will be pointed out inthefollowing Vde-v scription, I will now referto the drawing, in which lFigure 1 is Va view curb jack. Y Y

Figure 2 is a view in side elevation of the same curb jack on a somewhatreduced scale,V the curbing being shown sectioned.

Figure 3 is a view similar to Figure 2 but showing a modification in thepivoted jaw to in perspective of my adapt it to a dierent shape of curb.

The curb jack includes an upright10 hav; ing a lower jaw 11 projectinginwardly therefrom. The standard 10 is preferably made tubular as byuniting two channel beams and welding them at the meeting edges. The twoarms 12 project inwardly, they beingweldedv or otherwise secured attheir outer extremities to opposite Vfaces'of the standard V10. f'

tion of a pin 16.

The standard 10 is provided with a trans-.

verse aperture at or near its junction with the brace 14. A releasablepin 17 passes through this aperture and also through thejaw members 18on opposite sides of the rnrrmxomlv, NnisnAsxA I iesaixseni No.818,201.' Y v v standard 10.v VAs best shown in Figure: '17th-er jawmembers 18 a'rereach L-sha'ped inzcross section and their `form lis(such 'as' to seat against the curb for whichthey,areshaped.

The' jaw members 18 have movement ontheir e jaw members irstoutwardly-.and vupwardly '65 to the projecting endfportions fof theopin'16 and'thenupwardly to a hook-21 connected* V with afrhoisting` device.l v i Curbsare made in varioustypesof shoulders-but the curbljack as'above described is 70 easilyradaptable'to any curbing. The*4 pivot pinis "purposely'ma'de removableso that other'jaws may replace the jaws 18depending n on the Qarticular type of shoulder for the curb.- s `shownin Figure 3,'thejaw 18is 75 shapedto conform totheshoulderof the curbing'thereshown 'f 1. In; use,l Vthe curb jack is-placed imposition byfirst: excavating at the side offthe fcu'rb ing this beingspreferablyydone with'atiling 80, Y

shovel. ..The' excavation needbeyonly largeA Y enough to admit the j aw11 and the bottom portion ofthestandard and it-m-ustbe only deep'enough-:to allow the jawfll to enter. the space underneath 'thecurbing. The l pivoted Q5, jaws mustconform to theshape of the shoulder'of the curbing;y The pin'l-is adjusted so-that'i'tiwill besubstantially inthe center f lineV ofim'ass of the curbing* .Anysuitable hoisting ldevice 'is employedfthis being ,placed preferablyatthejside'ofthe pavement. -Liftf ingpowerappli'ed throught-he hook l21will be transmitted 'throughthergcable2O at the point '.16 'to liftthecurbinguniformlyiso j that. it willfbein horiZLOntal positionthrough-v L vout itsfliftingmovement. `The lift ordinarily is ybut, `aVfew inches, .QIfdergto bring grade. Afterfthe curbing hasbeen lifted tograde it is held in that `position' .while any.V suit 55 Y edj awtolmove to-curbengaging position and then lift the curb sec-tion withAthe center of engaging the curb, and means for applying into the spaceunderneath the curb section. After the space has been filled the liftingpower through the hook 21 is released whereupon the jack may be placedin position to perform the same operation with another section ofcurbing to be lifted.v

The cable 20 'enters not only into the lifting action but it 'also movesthe pivoted jaws 18 to curb engaging position. Any tension on the cable20 is transmitted directly to the jaws 18 to cause these jaws to closedown on the shoulder of the curbing. When the ten-V lifting power in thevertical center line of massl of .the curb sectionto be lifted and forsimultaneously actuating said c jaws int-o clamping engagement with thesection of the fcurbA to` be lifted.

2. A curbjack having a pair of jaws for engaging the curb, and means forapplying Y lifting power in the vertical center line of mass of thecurb'section to. be lifted, said j 3. A curb` jack having apair of jawsforl .Y abutment being adjustable into theV vertical centerline of massofthe curb section, and

, means including an adjustabley abutment 'on said jack for adjustmentintovr the vertical centerline of mass of any. of the various types ofcurbing. f

engaging the. curb, one of said; jaws being movable; to. curb. engagingposition, and means for applying lifting. power in the vertical centerline of mass of thecurb section to beilifted,said means including acable `having 'a connection with said movable jaw for movi ing saidmovable jaw to curbengaging posi-l tion. l

4. A curb jack havingV a pair of jaws for engaging the curb, one of saidjaws. being pivotallyl movable to jaw opening or closing position, anabutmentin the center line of mass ofthe curb section'to belifted, and al YLetters Patent of the United a cable secured tol said pivoted jaw andpass ing underneath 'said abutment whereby upward movement of said cablewill cause said pivoted yj aw to move into curb engaging posi- `tion andthen lift the curb section with the center of lift in said abutment.

6. A curb jack having a pair of jaws for engaging the curb, one of saidjaws being `p ivotally movable to jaw opening or closing position, anabutment in the center line of mass of the curb 'section to be lifted, acable @secured tosaid pivotedjaw and passing underneath said abutmentwhereby upward movement of saidcable will cause said pivoted jaw to moveto curb engaging position and -then lift .the curb. section with thecenter-fof lift in said abutment,and yieldable means, for normallyurging said pivoted jawinto jaw opening position.

In testimony whereof'll affix; signature.

iis

cablesecured to said pivoted jaw and; passing ,t underneath saidvabutment whereby upward movement of said cable will causel said pivot'-lit in said, abutment. f

5( A curbjackhaving a pair of jaws for Y engaging the curb, one of saidjaws being pivotally movable to Vjaw opening `or closing position, anabutment in the center line of! mass of thefcurb section to belifted,said

